Office chair



1.1 is a front perspective view showing my new design;

1.2 is a rear perspective view thereof;

1.3 is a right view thereof;

1.4 is a left view thereof;

1.5 is a front view thereof;

1.6 is a rear view thereof; and,

1.7 is a top view thereof. 

CLAIM The ornamental design for an office chair, as shown and described. 